Redmine

This patch adds and enables the Bullet gem in the development environment. Bullet helps Redmine developers detect query problems such as N+1, making it easier to improve application performance during development.

For example, the following Rails log is shown when viewing an issue in development:

 ...
  ↳ lib/redmine/preparation.rb:383:in `block (2 levels) in prepare'
  Rendered layout layouts/base.html.erb (Duration: 1414.4ms | GC: 251.1ms)
Completed 200 OK in 2320ms (Views: 1377.8ms | ActiveRecord: 81.2ms (102 queries, 16 cached) | GC: 307.1ms)

user: developer
GET /issues/1
USE eager loading detected
  Journal => [:updated_by]
  Add to your query: .includes([:updated_by])
Call stack
  /redmine/app/models/issue.rb:919:in `visible_journals_with_index'
  /redmine/app/controllers/issues_controller.rb:97:in `show'
  /redmine/lib/redmine/sudo_mode.rb:78:in `sudo_mode'

user: developer
GET /issues/1
AVOID eager loading detected
  User => [:email_address]
  Remove from your query: .includes([:email_address])
Call stack
  /redmine/app/models/issue.rb:919:in `visible_journals_with_index'
  /redmine/app/controllers/issues_controller.rb:97:in `show'
  /redmine/lib/redmine/sudo_mode.rb:78:in `sudo_mode'